Simulation Analysis Of Temperature Field Of Preload Filling Spiral Case

The analysis of the internal temperature field and temperature stress field of concrete is a complex project and has always been one of the focuses of the construction industry.Nowadays,the hydropower industry is developing rapidly,and the concrete around the preload filling spiral case is becoming bigger and bigger.During the construction process,the pouring is not completed once,and the concrete of different thicknesses is determined according to the actual situation before the layering is carried out.In the early stage of pouring,the hydration heat of the cement releases a large amount of heat.The outer surface of the concrete is thermally convected with the outside air to dissipate heat,and a complex temperature field is generated inside the concrete.The resulting stress field will cause cracking of the structure,posing a serious threat to the safety performance and service life of the project.Based on previous studies,and considering the analysis of hydration heat,convection boundary conditions,ambient temperature,water temperature inside the preload filling spiral case,initial temperature and other factors,and describes the the simulation calculation theory of temperature field and temperature stress of mass concrete.Using the finite element software ANSYS,taking an existing project in Yunnan as the research object,and the modeling was carried out according to its engineering drawings,analyzes and studies the temperature field and thermal stress field and gives a reasonable suggestion.It can be seen from the calculation results that the initial temperature has a significant effect on the maximum temperature of concrete.The higher the initial temperature,the higher the maximum temperature of concrete.The water temperature in the preload filling spiral case also has a significant effect on the maximum temperature of concrete.The higher the water temperature,the higher the concrete temperature.In the initial stage of pouring,concrete hydration heat dominates.After three to five days,the concrete temperature reaches a maximum,then the convection of concrete dominates.The overall concrete temperature gradually decreases,and as time goes by,the concrete gradually becomes stable and the temperature gradually approaches the outside temperature.The calculation of the temperature stress field is based on the calculation of the temperature field.The higher the temperature of the preload filling spiral case,the higher the overall temperature and the greater the stress value.In order to reduce the influence of temperature field and temperature stress field on structural safety performance,this paper combines the calculation results with the actual engineering,and puts forward reasonable temperature control measures to provide reference for practical engineering,and it is expected to achieve the purpose of improving the safety performance of the project,reducing construction costs,and improving construction efficiency.